#include<stdio.h>
#include<string.h>
#include<unistd.h>
int main()
{
    //C库函数
    printf(" hello printf ");
    fprintf(stdout," hello fprintf ");
    const char* ptr = " hello fwrite ";
    fwrite(ptr,1,strlen(ptr),stdout);


    //系统调用-写入
    const char* buf = "hello write\n";
    write(1,buf,strlen(buf));

    //创建子进程
    fork();
    return 0;
}
